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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-599) BufferedPositionedInputStream isn't buffered
Date Tue, 06 Jan 2009 00:47:44 GMT
BufferedPositionedInputStream isn't buffered

                 Key: PIG-599
                 URL: https://issues.apache.org/jira/browse/PIG-599
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Alan Gates
            Assignee: Alan Gates
             Fix For: types_branch

org.apache.pig.impl.io.BufferedPositionedInputStream is not actually buffered.  This is because
it sits atop a FSDataInputStream (somewhere down the stack), which is buffered.  So to avoid
double buffering, which can be bad, BufferedPositionedInputStream was written without buffering.
 But the FSDataInputStream is far enough down the stack that it is still quite costly to call
read() individually for each byte.  A run through a profiler shows that a fair amount of time
is being spent in BufferedPositionedInputStream.read().

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